2006-12-20

Graph and Pagerank

Graph和Pagerank目前在检索里有了越来越广泛的应用。

首先，Graph已经成为特征表示的一个重要模型，现在很流行用Graph表示一篇文章，相对于传统的关键词集合，这种表示已经大大的包含了文本本来的信息。


而pagerank算法则是Grpah中排名的一个重要算法，比如，自动摘要中，想找出一个文章中最重要的一句话，那么可以把文章中所有的话看作一个个节点，从而构建一个图，然后用pagerank算法对每句话的重要性排名。

graph表示中的主要问题就是
1.如何定义顶点
2.如何定义边
3.如何定义边的权重

而pagerank的作用就是给每个顶点一个排名

看来pagerank，以及Page那句网络是个图的想法，对计算机网络的影响还是很深远

现在基本的思想就是
1.任何事物都可以用图表示
2.任何事物的排名都可以用pagerank算法
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